Display screen with a transitional graphical user interface



FIG. 1 is a front view of a first image in a sequence for a display screen with a transitional graphical user interface showing our new design; and,

FIG. 2 is a front view of a second image thereof.

The broken line at the periphery of the figures illustrates a display screen, and the remainder of the broken lines illustrate portions of the user interface. None of the broken lines form part of the claimed design. The subject matter in this patent includes a process or period in which an image changes into another image. This process or period forms no part of the claimed design. 

CLAIM The ornamental design for a display screen with a transitional graphical user interface, as shown and described. 